I was taught in driving school in the '60s to use one foot only to prevent pressing both the gas and the brake in an emergency. But to be honest, I’m sure our brains are quite capable of being programmed to react properly using both feet. We’ve had a number of threads on this subject in the past and regular posters that I have a great deal of respect for say they’ve been driving with two feet for decades. The only caveat is to learn not to “ride the brakes”, but one can train oneself not to.
We can program ourselves to do amazing things. Pianists train their hands to do totally different things, yet maintain an very structured relationship between what the two hands are doing. Our brains can do wonders. The only caveat is that they need to be trained. If you never teach yourself to do the thing properly it will not do it by itself.